基于金刚石NV色心的纳米尺度磁场测量和成像技术  

Nanoscale magnetic field sensing and imaging based on nitrogen-vacancy center in diamond

作　　者：王成杰 石发展 王鹏飞 段昌奎[1,2,3] 杜江峰 Wang Cheng-Jie;Shi Fa-Zhan;Wang Peng-Fei;Duan Chang-Kui;Du Jiang-Feng(CAS Key Laboratory of Microscale Magnetic Resonance, University of Science and Technology of China, Hefei 230026, China;Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China;Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China;Department of Physics, University of Science and Technology of China, Hefei 230026, China;Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China)

机构地区：[1]中国科学技术大学中国科学院微观磁共振重点实验室,合肥230026 [2]中国科学技术大学量子信息与量子科技前沿协同创新中心,合肥230026 [3]中国科学技术大学物理系,合肥230026 [4]中国科学技术大学合肥微尺度国家实验室,合肥230026 [5]中国科学技术大学近代物理系,合肥230026

出　　处：《物理学报》2018年第13期37-45,共9页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2013CB921800);国家自然科学基金(批准号:81788101;11227901;11544012);中国科学院(批准号:GJJSTD20170001;QYZDY-SSW-SLH004);安徽省量子信息技术引导专项(批准号:AHY050000);中央高校基本科研业务费专项资金资助的课题~~

摘　　要：纳米级分辨率的磁场测量和成像是磁学中的一种重要研究手段.金刚石中的单个氮-空位点缺陷电子自旋作为一种量子传感器,具有灵敏度高、原子级别尺寸、可工作在室温等诸多优势,灵敏度可以达到单核自旋级别,空间分辨率达到亚纳米.将这种磁测量技术与扫描成像技术结合,能够实现高灵敏度和高分辨率的磁场成像,定量地重构出杂散场.这种新型的磁成像技术可以给出磁学中多种重要的研究对象如磁畴壁、反铁磁序、磁性斯格明子的结构信息.随着技术的发展,基于氮-空位点缺陷的磁成像技术有望成为磁性材料研究的重要手段.Magnetic field measurement and imaging with nanometer resolution is a key tool in the study of magnetism.There have been several powerful techniques such as superconducting quantum interference device, hall sensor, electron microscopy, magnetic force microscopy and spin polarized scanning tunneling microscopy. However, they either have poor sensitivity or resolution, or need severe environment of cryogenic temperature or vacuum. The nitrogen-vacancy color center（NV center） in diamond, serving as a quantum magnetic sensor, has great advantages such as long decoherence time, atomic size, and ambient working conditions. The NV center consists of a substitutional nitrogen atom and an adjacent vacancy in diamond. Its electronic structure of ground state is a spin triplet. The spin state can be initialized to mS= 0 state and read out by laser pulse, and coherently manipulated by microwave pulse. It is sensitive to the magnetic field by measuring the magnetic Zeeman splitting or quantum phase in quantum interferometer strategies. By using dynamical decoupling sequence to prolong the decoherence time, the sensitivities approach to nano tesla for a single NV center and pico tesla for the NV center ensemble, respectively. As a sensor with an atomic size, it reaches single-nuclear-spin sensitivity and sub-nanometer spatial resolution. Combining with scanning microscopy technology, it can accomplish high-sensitivity and high-resolution magnetic field imaging so that the stray field can be reconstructed quantitatively. The magnetic field is calculated from the two resonant frequencies by solving the Hamiltonian of NV center in order to obtain the value of stray field. Recently, this novel magnetic imaging technique has revealed the magnetization structures of many important objects in magnetism research. The polarity and chirality of magnetic vortex core are determined by imaging its stray field; laser induced domain wall hopping is observed quantitatively with a nanoscale resolution; non-linear antimagnetic order is imag

关 键 词：NV色心 量子测量 磁测量 磁成像 

分 类 号：O482.54[一般工业技术—材料科学与工程]